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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa42db0a45fef5d358e35e11580404e5c6c68b97430c923bbd58006786668fe1' 
  AND token = 'TW3N/HzIXx1kpoGcB8CcWXZmdNeSm8WqC+pkTpGQocY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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