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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f067d1fe8d564d5a481ca9d1c88147b29d2d66d38c778061dfd8181bdfcd79b9' 
  AND token = 'PQcqOM9loqQ7aDtdpCQD/40yHiAHauNHJOt9t0GtvZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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