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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '583eace1f7a19145fbf40b9f345b7f8ba79bebce061aef2f10833f3ae18b86a0' 
  AND token = 'zR34Ge5cBXNNkid6zx8pMxfzny3vJ7oJJ4Lr5BSERDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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