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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd51ec8ba6ea6a37ce2d35bd38dd745dafb61a0c0ec150bd722924727d55bc761' 
  AND token = 'TEqy6IEQFAswLxy+U/HO+L5MHjrs/9DVYdQbm1Iv3Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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