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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dae4e74c2cc2b6674d092e7483669a4a200bce73b4dd07435e60f7b7ce4593a6' 
  AND token = 'aMPJFbD/4NC4biSHCnkinQzrKvZpu23888gO1Qa0gXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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