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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6038abd73d08005f27c2ff5b27a38414e2a5dd7f89033b751e3b80100684785f' 
  AND token = 'jqEOLhKkKVNe7NFc2TuVWI2EkOd4qkIod6jO+mfYJx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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