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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0dd994d77a0e1aaf16f862ea239c7a99b756536f0707a3588bdda5c04eaac8c7' 
  AND token = 'ubHKmZdN5cLBuhEMyx5/JgScscKiT4J5P3U2Asx25vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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