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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59a6a0b2ae21db4e668bc06cc7bddc53334b8a603ce32c08032d906d1ec694f6' 
  AND token = 'bBwvMDEkzzbpqUusXVk5ys9nZ5jIDpamwLGRBXM4QEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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