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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cea0f811d704414f74b49a33090b92d314b59948e9d05b75b3762dfa4020a85' 
  AND token = '11HnJ4ubu4RKGXFLbupmsy6QnEv5v70+Mo8mgzYksfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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