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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6794ca61ab3835c8e83722ddbb45ee58dfeaa161bb763d447b457ca2e8a1cbca' 
  AND token = 'ks8Am23Y+qJa9TOGAvdD4TXKxajqegDV88GBEc+0F30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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