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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b30c3ff6cefcf157ae3edd7249bc842f9dbdfd414d9ff8e79cbb8b8d76b89f88' 
  AND token = '2y4qiWEWUXmG/kzubv2CjS2sqyybmCVndsIqAy5gDug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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