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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f64e89245a87c0c213383a0013c1acd122aa168e4f3a92c0a50ee3ee1e961450' 
  AND token = 'mQD8K02puZSSK61PolqNLQ6e5HmVHuzTUOtbM0epd7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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