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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cbd4366f3d2a114e996f737dfc14d3167d9731931f4edb0c39c5f52b440bee06' 
  AND token = 'aDeAtSXv8K1mSTCz0f1Fr2SE3cdrQsqqwi/LMEDKrnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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