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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd51dca61fe59118e6e6f17c98ff2033857eaa16f95ea4a95d863aac612e7fca' 
  AND token = 'sp4fCyQJ80c+04ASm1ByTxhnm1TA6MCPRiLiHl10ISg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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