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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d7c2b6c2becf74a9303e76d3bedc17d5545744749a51003ab5317698d4b2efd' 
  AND token = 'A3Dph2gjCptIa5E1R1YMKzrte3XJJzEh2oUjtgoMHUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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