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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa5e7a95aab14b22e5ed7318483f5e7997a6feeca38845a740fb9c2367e0a3f2' 
  AND token = '2KGK5D+NUn+hin6igt6b4iQxNr3pXP6pxy+11mJh740=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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