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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da82d3a2c147528a36de3d1625f240b444ee1b20872679ef39c4a7f535253524' 
  AND token = 'HGF4XNDIezZucOD9W6otTNmKq5kYprwlxInq6cjnfGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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