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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '815c4fa0b574f041c7a22471c29260f8b6bc3247fb57541fafeceaaabaa3fc88' 
  AND token = 'hLu08u7uWyLVSAeMGuBhCe+gG9zHq64ng0Uh3OE6z6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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