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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b72df06fb68e5431b536afab4a43203055c89df159e19f1bab07e88e2e68d57c' 
  AND token = 'mtO2uMYE3Y9htSygM5n4Qy3I/B+7drC9o/Zl1mSoBYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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