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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6df98c04a92dfe0137cec2a76525d691e29a2ebc9322a876103cff9b7f84318' 
  AND token = 'bIEUt9x72zKobSxuiAluu6gE1GzfB5GT03yM3YNgtns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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