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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce32bfd3c936da563142449189d81497981702b64671488752edfc0d15f0e480' 
  AND token = '9JIJ/uhb6330y2oftyXO2Zoow+yObZNIcEwM0LtN6WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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