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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '366e8d65c96c7502747b71beaff7dd65469c184c5b73e9a09d9e98070d9e3903' 
  AND token = 'g9dylACTrl5QdwyE0xWAdvC2mn7ApWvmxuWpazugxZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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