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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e349e5f4c243a841990839ba625d9ed8f1e61fa516748a53d1abb1a90d62e0d' 
  AND token = '+KlHTZHva0giN6JuuG6Z6P+PfFhLE0G6EiEL8ZGsTFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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