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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f9405002e335d9f4c498a910acb288982a34bba8a8856c251fcbdd9615c2429' 
  AND token = 'RNxal31Ivmx0Pa2dz4c2gEtdVnYdxa/ImUn5DYoJSow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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