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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb6da64af41b512034402be1052c47335019beac6bacea0e181b3be0c6645882' 
  AND token = 'aULBemEOi4/u9qNLS1BS86wq+9Pt50oaAp3N8+incI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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