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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf7e25d1840e5ec619ac3a1f9feb21503b77cc9d6a925de593370c633ca54d2f' 
  AND token = '95ThN0CM6SBiOw3R4HIIXUg9DCTZWeXlJizk12laKLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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