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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4fb29e563a918d6667bb33ad7a436920271e95d21d28a95861d4ca933ac81863' 
  AND token = 'f17Yws5Sv4dILs+fsmi3GUJV1p0N3djs/PSx4sXGtoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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