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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a935a164a9d909cfe8050c36b805ada69ea87f269e8c10bcca3e7e16e9c6d36' 
  AND token = 'sFnPTtX6bTKlbGkHjSjjZ5IO+F9BdDttN1S7XiBsYEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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