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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2425d8544a7d00d386bdba6c5990b3d3e79a9d263e8ab6d584ac14ea061bbb4a' 
  AND token = 'lDNhZa8x17NTJW1Plb7Tc0xGVA3qLPP7QsnnF532W0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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