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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '554adf4013e747bebd829dc4015d3dcde0a2c13489c51f5325863facc368de06' 
  AND token = 'WDXEJTLXWMrbLnFE1U2l0FWDDS0xA5KqqRbKHuLOnw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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