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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c007833c7a575f8e0c8352fadf726eded5e24c621178cf1452ba8a9e8114f792' 
  AND token = '2u5Kb5StE+lf3n2KMtmLWByhrO81Y+WPSVBApvRjr4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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