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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c61dc5c073867c78c0696c9ea45daefe3fcf4c7a0c0fdcbf4c47d224b96ae570' 
  AND token = 'vT8nU3bCk+a3aMQhFYx6xIXK3LD/Oi22qCUH1ReI0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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