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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '49161b1f36d22be9b1d0ce170f7fd68764505dae372a995feedbbe000464f3a8' 
  AND token = 'gE4jkBc+qbdnjv8kNjR4KcQ4pXa1orgH0oZ8Ukxquto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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