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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4d7a5a5ba24304adff46f05959a7ff56507d5ad50764bc8ffd93cf98d5ff208' 
  AND token = 'h1Yp67S4kODA7WjejUljUL7uZMrcW/871y9Vw+U73y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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