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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd9fd5d6c20be96b2263c4f55f7af2e63ea3b0afa2b33e2fc9337b095a7ea0e0' 
  AND token = 'vsTgfG4UKwI0s8F0wxqaARyaf7pjHZn6eL9mVWXS84k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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