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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af659441756d57111a1bc3cac0707df56a9e62d97ce72d5ffb59702479db645b' 
  AND token = '1xC+6Ax/i6iOWFZOzsdamafVrab0Cb91PS68fJjenN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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