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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c86817e36f9671549128183e3961e573ff8c370c45a8da3af5304e2ec299ed10' 
  AND token = 'a5690McJaya/AIkNIhUj4vM2hg1/eywyHH4luWQGal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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