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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75e185a285ee742b2b406c84b835948df6ac3c1251a13e51c65901a2b24676b6' 
  AND token = 'jfUkmYHJqGEPjJO19i+Rio7wLjjdRegLE+ydStxcp7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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