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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67cecaa7edcaa4d3fe07b7b9d6ea0221180d5405a80223cb7ac96dd8fa41d9df' 
  AND token = 'iXXzd2Y66XZQdTypE9x15Y2jldaEnC+3R+QQwMebXdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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