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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7d9cb6a415b442364f4d8eee8ffd6b71db326da92fcd003641a4f166aa2074c' 
  AND token = 'LYouL6NDyRNp7eIuC2GGDfm1IoY+Hdzv/6SgbM+jwVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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