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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e71b245634f8c8ff4cf822798d7341a9b0ae77b7ac07f3eb58c0f54a9e012b4a' 
  AND token = 'HhuD19xl1m5Ph7oxYxKy1az4Q/QZ9S+CuTXoneukKuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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