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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd024fd59a1423c703e85fc07a87f741070cb27a2dd323aa43797099536d74445' 
  AND token = 'iXHAkj2+3cDOBTbVFB+TtS111X9Fxr4zSz1RhSSdvR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}