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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e6690f0f133dfcb0d6d9bde42958d7a3c9f7ed1ba57df561bb1fd1aecde852e' 
  AND token = '6l7oHqcjJgyVFiuQjthsxd9Y0DNQrCyMjN1VvbM1mlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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