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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd51b871e69e12a7000c39fa17516e457ef10aeea91b7b616f0add9fa16992690' 
  AND token = 'yT1qh5qK+oEbh2vOyBbNbZAwpcqeHuRXTXezv4QNfUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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