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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7ddbf9ca12a7596ee1d81784995645949cbc8f4db202b0a80dd6cac794f8eb0' 
  AND token = 'Qh/J8OoOsuC1KqukBzpmRz97ZOMZNnnHcVtciQlQ4/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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