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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6417540f95ebdbfab239a3f5e9bb70ccf2af5cb5c07df7575da188bd10415db7' 
  AND token = 'Oizf51jCUoA+pozBYrxo5ZxmS/W+tL4EJLZ9k2NAMAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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