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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b0f692c50ef99bc794b9e28fabff3eeb7d0a39245c92c387ba5a01db9e7d2a1d' 
  AND token = '9Vp79Nq1kTuLNq3tlb4f8J0dWymabtd43lD2WrsWasI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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