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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aac86282d8f8d9ad756b0d9c2b8a83dd2db384781296991ebe2dd8d9ad7b2792' 
  AND token = 'm0Qh29ehXOyGe3X8ByzqRTYPEltyk1sUK4TYYEF/9pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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