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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e050ca22595283de580bc52aae10a32f873ad8a9fbeb94afcf38c8d633f64dd' 
  AND token = '0fh2oSJsJN6QsHIKTPjBLvcfzC+mniwKOTLxk0JrnLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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