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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0478edb33325d4bf27b48109dce4b86167ca5e504a6503ae5639453ad6324a9a' 
  AND token = 'tUezMkpkO8l8wElvr3IV7sOYAwhoTaFrTuTI5k43C74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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