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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8eb25ce632499209cc682b7ed36ad671cf4e4f323cb8246da45bd483507e932' 
  AND token = 'wch3AnT9jZzRSkwFqZpM4PHtbElc0yDb332nsOUMxZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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