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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4dec928a4e8c3a7e088ad9fa7f1e45a4ff51fa233b88e68a71d9db7438920762' 
  AND token = 'RhFbabmm9YfhOOFPSDYqxHvrILaaHiMstLhm4KUFE00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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