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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '90d63963d228649553b2841ee380ae13e47455203511ca8ba38d350c44259b48' 
  AND token = 'E8d3Z4uX4mIQTP3qyCU/g2LYJ7jIHLXH4ADYEDBeMms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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