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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f1409b09f10a1c70f9fc3920b1a14e0e637eaafc0cbbca4c6679f81acc70793' 
  AND token = 'bv1oWlazsRnnR0TCzRUS6JnbQ+VurECectW9kUErV48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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