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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7989a36468f5837947ded1b9f461056c0898a9876adddf996059cef0308d0ed6' 
  AND token = 'nhQ/5QA/04BEgtpRap9fKs7scNeiVu+FOXUhkD1dQa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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