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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67ff85e0a198a77cf243b6970f88856eec2e539a7639e02f3421027a9c40431a' 
  AND token = 'sZmFB0xP8l7LVxThND6yC/5zaE1lC8cM7h1mFh7M/Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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